Fig. 3. Comparison of Minolta SPAD-502 chlorophyll meter readings with chlorophyll content derived from Eq. [5] with measured reflectance for 288 Edelweiss grapevine leaves. (A) Chlorophyll contents ranged from 63 to 576 mg/m2: 288 yellowish to dark green leaves; (B) Chlorophyll exceeded 300 mg/m2: 148 green to dark green leaves.